Mottslott,
Montsport operate out of "Horta De Sant Joan",you can hire bikes from the shop & go as far as you want along "The Green Way" & they then come & pick you & the bikes up!   Of course you will get all the details of the route and their advice  in the shop,so you can pre-decide on where you want to be picked up from & at what time.I used them last Summer & the whole thing worked quite well.

http://www.montsport.es/en/via-verde-terra-alta/que-es-la-via-verda/